- 21 - BUFO. 



30. Reproduction. (a) Make a fresh preparation of a small piece of testis teased 

 111 a drop of 0-(55 per cent salt solution and examine it under the high power. Draw 

 examples of spermatozoa, showing head and tail; (b) examine a piece of ovary in tli<- 

 same way and draw unfertilized eggs on the same scale as the spermatozoa. 



31. Development. Draw eggs in different stages of development. 



32. Development. Look at the demonstration of living tadpoles. 



33. Development. Draw a specimen of a newly hatched tadpole, showing external 

 gills and sucker. 



