324 



APPENDIX. 



sections of anthers, ovaries, seeds, etc. The lens shown in 

 Fig. 353 is very convenient ; the lens can be slipped off the 

 rod B. and carried in the pocket. As represented iu 

 the figure it can be used as a " dissecting" microscope, the 

 specimens being placed" on the base below the glasses 

 and the latter slipped up or d'owQitill it is in focus, or 

 can be plainly seen; with mounted. needles, or similar in- 

 struments in the hands, a small obj.ect or delicate, specimen 



can be turned and examined at will. When parts are 

 too delicate to be held between the fingers, in making 

 sections,, they, can be clamped between two pieces of elder 

 pith; or, better, slit a short piece of the pith nearly its 

 whole length and insert the piece to be, cut, pressing the 

 pith between the thumb and fingers as before when cutting. 

 328. In order to watch the process of germination and 

 follow the development of the organs, seeds may be planted 

 in the spil out of doors if the study is carried on during 



Fig. 353, A Pockel hens, mounted as a dissecting microscope. 



