60 THE MICROSCOPE. 



drops of oil and grayish colored, granular masses. The lower epi- 

 dermis (<?) is much more delicate, while the cells are either collapsed 

 or are smaller, and the cuticle is thinner than the corresponding 

 parts on the upper surface of the leaf. Two of the large epidermal 

 glands (/i) are yet attached to the lower epidermis. 



^ & 



b 



Fig. 4. Crystals Found in the Caroba Leaf, x 750 diameters. 



A chemical examination of the leaf has been made, with the 

 following results.* In 1,000 grammes of air-dried leaves there were 

 contained: 



Carobina 1.620 



Crystallic carobic acid' 0.040 



Crystallic carobic, sebacylic acid 1.000 



Carobon (balsamic resin) 26.666 



Neutral resin — not perceptible to taste or smell 33-334 



Chlorophyll and vegetable wax 9.000 



Extractive matter 10.550 



Extractive matter, tartaric, lactic and oxalic acids 10.000 



Malic acid and calcium , o. 200 



Tannic acid 4-39° 



Albumen, dextrin, malic acid, inorganic salts, etc., fibrine 



and water 885.010 



Balsam (extractive matter) 14.420 



Substance resembling humus 0.890 



Bitter substance 2. 880 



*This report was given by Chas. W. Zaremba, M. D., in the Therapeutic Gazette of Feb- 

 ruary, 1S80, p. 34. 



