SUGGESTIONS FOR STUDIES IN HISTOLOGY 

 AND PHYSIOLOGY OF PHJENOGAMS. 



The following hints are designed chiefly' to aid students who 

 have at their command the simplei- appliances described in the 

 foregoing pages. In addition to the simplei- exercises there ai-e 

 also suggested a few which are quite within the power of students 

 having access to a small chemical laboratory' and a small cabinet 

 of physical apparatus. The chemical and pliysical outfits now 

 found in rnan3' of our high schools will prove ample for the 

 successful prosecution of these experiments. 



HISTOLOGICAL PRACTICE. 



Material for study. The supply of material for histology 

 should be abundant and of the best quality-, all inferior or imj^er- 

 fect specimens being carefully excluded. It (except that dis- 

 tinctl}' referred to s,a fresh) should be collected at proper seasons 

 and preserved at once in strong alcohol, great care being exer- 

 cised to have every specimen accurately labelled ; name, locality, 

 time of gathering, etc., being noted. When alcoholic material 

 is required for immediate use in the preparation of sections, it 

 can be softened, if necessary, by soaking in pure water, as 

 directed in 37. 



Delineation. When a satisfactory section or preparation has 

 been secured, the student should make an accurate drawing of 

 its essential features. The employment of a camera lucida (12) 

 insures correct proportions in all parts of the sketch, and is 

 always to be recommended. Drawings made by its aid are con- 

 veniently designated by the following abbreviated term, udnai. 

 del. It may seem scarcely necessary to caution students against 

 obscuring any part of their histological sketches by meaningless 

 shading ; a few clean and clear outlines suffice to express the 

 character of the preparation better than any attempt to give the 

 Qffects of light and shade. There are some exceptions to this 



