Abstract
Experiments which I previously reported show that the adult male and female and the nymph of the Rocky Mountain woodtick (<i>Dermacentor occidentalis</i>) are able to acquire and transmit spotted fever.<sup>1</sup> In this paper experiments will be reported which show: 1, That the larva may acquire the disease and remain infective during the nymphal stage; 2, that the virus may be transmitted from an infected female to her young through the eggs; 3, that the virus exists in both the gut and the salivary glands of the infected tick. <h3>I. INFECTION OF THE LARVA.</h3> In these experiments the possibility of the larvæ having acquired the disease from the female parent through the egg was excluded by testing the females on healthy guinea-pigs before they deposited their eggs, and it is to be understood that all the larvæ used in these experiments came from females which had been tested in this
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