324 



APPENDIX. 



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

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

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

 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 down till it is in focus, or 

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

 struments in the hands, a small object 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 soil out of doors if the study is carried ou during 



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



