394 THE AMERICAN MONTHLY [Nov. 



could now by this natural process show as actual crys- 

 tals ? 



The question naturally arose how far these crystals 

 were due to the action of the Bath waters at different 

 temperatures on these nuts, either by coming through 

 cracks or absolutely finding their way through the pores 

 of the shell, and how far they might be due to the 

 properties of the hazel nut. He was at one time half 

 disposed to think that he must credit the hazel with 

 some share of the performance, but he was rather dis- 

 posed to give that theory up, as one day he had acci- 

 dentally discovered similar crystals in the skull of a 

 Romano-Brittonat the Pump Room. Another curious 

 feature about these hazel nuts w^as that the spiral fibre 

 was found to have remained, although the nuts them- 

 selves had perished. It was sufficiently perfect for the 

 instruction of a Botany class. The lecture also con- 

 tained other points of interest, and Mr. Morris was 

 heartily thanked for delivering it. The specimen 

 hibited by Mr. Morris were of great interest and beauty. 

 — The International Journal of Microscopy arid Natural 

 Science. 



The Tsetse Fly Disease in Zululand. 



The tsetse fly disease, called " magana " by the natives, 

 occurs in the horse, donkey, ox, and dog, and varies in 

 duration from a few days or weeks to many months. It 

 is uniformly fatal to the horse, donkey and dog, but of 

 the cattle affected with it few recover. It is character- 

 ized by fever, more or less rapid destruction of the red 

 blood corpuscles, extreme emaciation, and infiltration 

 of coagulable lymph into the subcutaneous tissue of the 

 neck, abdomen, or extremities, which consequently be- 

 come swollen. Post-mortem examination shows the pres- 

 ence of a yellow, gelatinous material in the subcutane- 

 ous tissue and under the serous covering of the heart, 



