diff --git a/src/epub/images/illustration-10.svg b/src/epub/images/illustration-10.svg
index 59e7b8e..4d1a892 100644
--- a/src/epub/images/illustration-10.svg
+++ b/src/epub/images/illustration-10.svg
@@ -1,4 +1,38 @@
\ No newline at end of file
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A drawing of a coral atoll in the Pacific Ocean showing its circular formation.
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diff --git a/src/epub/images/illustration-11.svg b/src/epub/images/illustration-11.svg
index a1e4c66..ee3b5c1 100644
--- a/src/epub/images/illustration-11.svg
+++ b/src/epub/images/illustration-11.svg
@@ -1,4 +1,14 @@
\ No newline at end of file
+ Drawing of the interior of a coral atoll, with an island and distinct peak in the center.
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diff --git a/src/epub/images/illustration-12.svg b/src/epub/images/illustration-12.svg
index 9d8a3e3..7753bd2 100644
--- a/src/epub/images/illustration-12.svg
+++ b/src/epub/images/illustration-12.svg
@@ -1,4 +1,17 @@
\ No newline at end of file
+ Cross-sections of three coral islands showing different levels of water in comparison to shapes of the land.
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diff --git a/src/epub/images/illustration-13.svg b/src/epub/images/illustration-13.svg
index 4907701..11f3032 100644
--- a/src/epub/images/illustration-13.svg
+++ b/src/epub/images/illustration-13.svg
@@ -1,4 +1,8 @@
\ No newline at end of file
+ Side drawing of a coral island with various labelled cross-sections indicated.
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diff --git a/src/epub/images/illustration-14.svg b/src/epub/images/illustration-14.svg
index a9195f0..05cb835 100644
--- a/src/epub/images/illustration-14.svg
+++ b/src/epub/images/illustration-14.svg
@@ -1,4 +1,8 @@
\ No newline at end of file
+ Side drawing of a coral island with the original volcano shown, with various labelled cross-sections.
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diff --git a/src/epub/images/illustration-15.svg b/src/epub/images/illustration-15.svg
index 96508b4..ee9b5b3 100644
--- a/src/epub/images/illustration-15.svg
+++ b/src/epub/images/illustration-15.svg
@@ -1,4 +1,50 @@
\ No newline at end of file
+ The interior structure of a volcanic bomb, showing the coarsely cellular central part, the cells decreasing in size towards the top of the drawing, followed by a shell-like case and outer crust.
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diff --git a/src/epub/images/illustration-2.svg b/src/epub/images/illustration-2.svg
index 171c3cf..37a22da 100644
--- a/src/epub/images/illustration-2.svg
+++ b/src/epub/images/illustration-2.svg
@@ -1,4 +1,15 @@
\ No newline at end of file
+ A mineral with inclusions resembling small plants.
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diff --git a/src/epub/images/illustration-3.svg b/src/epub/images/illustration-3.svg
index 4f9c484..731238b 100644
--- a/src/epub/images/illustration-3.svg
+++ b/src/epub/images/illustration-3.svg
@@ -1,4 +1,5 @@
\ No newline at end of file
+ Two tiny sea-creatures with bodies like tubes with conical ends, joined together.
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diff --git a/src/epub/images/illustration-4.svg b/src/epub/images/illustration-4.svg
index 6c6f5cb..c1ba44b 100644
--- a/src/epub/images/illustration-4.svg
+++ b/src/epub/images/illustration-4.svg
@@ -1,4 +1,7 @@
\ No newline at end of file
+ A drawing of the head and bill of the Scissor-beak bird, from the side, showing the much longer lower mandible, and from above showing its laterally flattened beak.
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diff --git a/src/epub/images/illustration-5.svg b/src/epub/images/illustration-5.svg
index 3a7729d..e30aa35 100644
--- a/src/epub/images/illustration-5.svg
+++ b/src/epub/images/illustration-5.svg
@@ -1,4 +1,18 @@
\ No newline at end of file
+ A globular fungus with its entire surface deeply pitted or honeycombed.
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diff --git a/src/epub/images/illustration-6.svg b/src/epub/images/illustration-6.svg
index 702a51d..d7ab64c 100644
--- a/src/epub/images/illustration-6.svg
+++ b/src/epub/images/illustration-6.svg
@@ -1,4 +1,37 @@
\ No newline at end of file
+ Sketch map of the glacier which reaches the Gulf of Penas, showing the length and width of the glacier, and a morass to the west of it.
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diff --git a/src/epub/images/illustration-7.svg b/src/epub/images/illustration-7.svg
index 921fb91..64fb410 100644
--- a/src/epub/images/illustration-7.svg
+++ b/src/epub/images/illustration-7.svg
@@ -1,4 +1,29 @@
\ No newline at end of file
+ Sketch map of the islands of the Galapagos Archipelago, consisting of ten principal islands, of which five are much larger than the others.
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diff --git a/src/epub/images/illustration-8.svg b/src/epub/images/illustration-8.svg
index 5d928f7..502d559 100644
--- a/src/epub/images/illustration-8.svg
+++ b/src/epub/images/illustration-8.svg
@@ -1,4 +1,23 @@
\ No newline at end of file
+ Four drawings of the head and beaks of related birds found on different islands of the Galapagos, showing the variations in beak size and type.
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diff --git a/src/epub/images/illustration-9.svg b/src/epub/images/illustration-9.svg
index 87eadf2..17e237d 100644
--- a/src/epub/images/illustration-9.svg
+++ b/src/epub/images/illustration-9.svg
@@ -1,4 +1,8 @@
\ No newline at end of file
+ A large lizard with small spines running along its back, together with a drawing of one of its teeth, both natural size and magnified.
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