Iqq The Philippine Journal of Science 1923 



they exhibit parallel extinction. Scratching of the preparation 

 is usually necessary to induce crystallization. 



The crystals tend to grow much thicker, polarize more strongly, 

 and are more irregular in shape than those from /3-eucaine. 

 They form much more readily than those from heroine and do 

 not form the spheroidal type of crystal characteristic of the 

 latter. Stovaine is also readily distinguished from cocaine by 

 this test. Plate 1, fig. 5. 



CONIINE 



Sensitivity, 1 : 50. 



Coniine yields with potassium ferrocyanide in hydrochloric 

 acid solution rosettes of colorless needles and long, thin, square- 

 ended prisms. Scratching aids in the formation of the crystals. 

 Under crossed nicols the crystals polarize weakly, exhibiting 

 oblique extinction. The extinction angle is rather large, about 

 30°. Plate 1, fig. 6. 



HEROINE 



Sensitivity, 1 : 50. 



Heroine forms spheroidal crystals with potassium ferrocy- 

 anide in hydrochloric acid solution only when the concentration 

 of the alkaloid is very high. These crystals often do not appear 

 for five minutes. With vigorous scratching there are sometimes 

 obtained hexagonal plates belonging to the hexagonal system. 

 Plate 2, fig. 1. 



HYDRASTINE 



Sensitivity, 1 : 700. 



Hydrastine forms with potassium ferrocyanide in hydrochloric 

 acid solution white, spheroidal crystals. Isolated crystals are 

 not present. The spheroids are polarized under crossed nicols. 

 Plate 2, fig. 8. 



QUINOLINE 



Sensitivity, 1 : 800. 



Quinoline yields with potassium ferrocyanide in hydrochloric 

 acid solution lemon yellow rhombohedrons exhibiting parallel 

 and oblique extinction. Scratching is unnecessary. The crys- 

 tals are very characteristic. Plate 2, fig. 9. 



SPARTEINE 



Sensitivity, 1 : 2,000. 



Sparteine yields with potassium ferrocyanide in hydrochloric 

 acid solution characteristic, colorless rhombs exhibiting sym- 

 metrical extinction under crossed nicols. Scratching aids in 

 the crystal formation. Plate 2, fig. 10. 



