1895,] Contributions to Coccidology. 725 
In the present cases the phosphoric acid was in the mylodon 
26.59 and the man 20.77, while the fluorine was respectively 0.28 
and 0.38, making the ratio between them, for the mylodon 94.96, 
for the man 54.70. Referring to page 455, we will see this test ap- 
plied to the discoveries of Billancourt. There the two fossil 
bones were respectively 23.9 and 19.4, while the human bone 
reached the high average of 168.9. Turning again to the table 
on page 447, we will see that this ratio was increased in the case 
of bones known to be modern to 193.1. This, therefore, bears 
out the contention of the value of this test—it shows two 
things, (1) that according to the averages made by Mons. Carnot, 
the bones under present consideration, the man and the mylo- 
don, are substantially of the same antiquity, and (2) by the 
same comparison their antiquity is about midway between the 
modern bones and those of the Quaternary geologic epoch. 
This investigation will be carried further by making analy- 
ses of other bones, some of which will be modern, some of 
known, and others of supposed antiquity. 
CONTRIBUTIONS TO COCCIDOLOGY.—I. 
By T. D. A. CocKERELL, 
ENTOMOLOGIST, NEW MEXICO AGR. EXP. STATION. 
The present is the first of a proposed series of papers on Coc- 
cide (Scale Insects); intended to make known some of the 
numerous new facts, especially regarding their distribution, 
which are constantly coming to light. The ever increasing 
traffic in living plants, which is going on in nearly every part 
of the world, is leading to the wide dispersal of injurious Coc- 
cide. No one who has not given particular attention to this 
matter can realize the serious nature of the situation, from an 
economic point of view. Not only is the number of harmful 
‘Coccide in each locality being greatly increased by importa- 
tions, but, as is well-known, the imported species often show a 
