Examples 



WHOLEMOUNTS IN RESINOUS MEDIA 



59 



Fig. 26. Balsam wholemount ready for drying. 



Chapter 1. With regard to labeUng, it may the label is to be attached should, there- 

 be pointed out that no power on earth will fore, be cleaned more carefully than any 

 persuade gum arable, customarily used for other. The writer prefers to moisten both 

 attaching labels, to adhere to a greasy or sides of the label, press it firmly to the 

 oily sKde: the portion of the sUde to which glass, and to write on it only after it is dry. 



Specific Examples 



Preparation of a Wholemount of Pectinatella 



Though this exposition specifically ap- 

 pUes to preparing wholemounts of the 

 animal named, it applies equally well to 

 the preparation of wholemounts of any 

 other fresh-water bryozoan or, as a matter 

 of fact, for any small invertebrate of about 

 the same size and consistency. Pectinatella 

 has been picked only for the reason that it 

 has a habit of turning up on the walls of 

 the aquaria in the writer's laboratory. If it 

 does not turn up in aquaria in the reader's 

 laboratory, it will be necessary for him to 

 collect the specimen. Fresh-water bryo- 

 zoans are rather like gold: that is, they oc- 



cur where you find them. Profitable hunt- 

 ing grounds are the underside of the leaves 

 of large water plants and the surface of 

 branches of trees which have fallen into 

 the water but have not yet had time to de- 

 cay. An old trick of European collectors 

 was to lower a length of rope into a pond 

 in which bryozoans were known to occur, 

 and to leave it there for the summer. It 

 was astonishing how frequently, when 

 these ropes were pulled up again in the 

 fall, they were found to be covered with 

 colonies of bryozoans. 



However the bryozoans be obtained, it 



