EXPLANATION OF PLATE 42 



All reactious phown forty-eight hours after the intradermal injection of alka- 

 line extracts of Leislimania tropica and Leishmania infantum. Figures natural 

 size and color. Drawings by Dr. Olive Swezy. 



Fig. 1. Normal rabbit No. 21 showing the results of the intradermal injection 

 of a 50 per cent dilution of stock solution of the alkaline extracts of L. tropica 

 and L. infantum, a. Alkaline extract of L. tropica, h. Alkaline extract of L. 

 infantum, c. Extracting fluid control. Drawn September 24, 1923. 



Fig. 2. The same as fig. 1 on immune rabbit No. 7. a. 50 per cent dilution 

 of the alkaline extract of i. tropica, b. 50 per cent dilution of the alkaline 

 extract of L. infantum, c. Extracting fluid control. Drawn September 24, 1923. 



Pig. 3. Immune rabbit No. 7 showing the effect of the intradermal injection 

 of the stock alkaline extracts of L. tropica and i. infantum as compared to a 

 50 per cent dilution of the stock alkaline extract of L. tropica, a. Extracting 

 fluid control. 6. Stock alkaline extract of L. tropica, c. 50 per cent dilution of 

 the stock alkaline extract of L. tropica, d. Stock alkaline extract of L. infantum. 

 Drawn September 17, 1923. 



Fig. 4. Immune rabbit No. 127 injected intradermally with alkaline extracts 

 of L. tropica and L. infantum containing 2,000,000 flagellates per cubic centi- 

 meter, a. Alkaline extract of L. infantum, h. Extracting fluid control, c. Alka- 

 line extract of L. tropica. Drawn September 10, 1923. 



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