12 HOW TO USE THE MICROSCOPE 



place the finger and remove the tube ; the water 

 will stay in it so long as the finger is held in position. 

 The contained fluid can now be deposited where it is 

 required by removing the finger. Tiny hving ob- 

 jects contained iia water are easily caught and tran- 

 ferred to the stage by this method, which is thus 

 particularly valuable in dealing with pond-life. The 

 mdiarubber teat on foimtain pen ink-fillers acts by 

 suction, and deUcate tissues can be washed by 

 ejectiiag water from the tube on to the object by 

 pressure of the teat ; but a glass syringe acts more 

 satisfactorily, and is not expensive. 



Many volumes might be filled with directions for 

 dissecthig, and it would be altogether beyond the 

 scope of this httle book to go into details. The 

 student usually takes up a special line of investiga- 

 tion, in which he mil have textbooks for guidance. 

 He must know what he is doing, and study the 

 anatomy of his objects. His procedure in different 

 lines of investigation will necessarily be greatly 

 varied. If my reader is totally unacquainted with 

 dissecting, and yet desires to make some progress 

 in the art, he cannot do better than commence with 

 a flower, some parts of which he can handle with- 

 out a lens. Let him consult an elementary book 

 on botany, and as he removes each part of the 

 floAver lay it out carefully on a card, writing its 

 name beneath it, arranging sepals, petals, stamens, 

 and pistil in order. The lens will be requisitioned 

 when stamens with their antlers call for attention, 

 and also when the pistil mth its stigma, ovary, and 

 ovules are to be examined. PoUen grains, sections 

 of ovaries, and ovules and other details, wiU need 



