. Science-gossip. y be common onother animals. This is anal-agous to the fact mentionedby Mr. Barber in Nature(June, 1895), that in Antiguaticks leave infested cattlewhen they are changed to abelter pasture. On theother hand, I am unable togather that the poorer sheepon the hills are more suscept-ible than those in better condi^tion; but have been in-formed that the contraryis to some extent the is, however, among sheepfreshly imported on tofoul ground that thegreatest mortality takesplace. A satisfactory ex-planation of an immunity,which does not seem todepend altogether on the condit
. Science-gossip. y be common onother animals. This is anal-agous to the fact mentionedby Mr. Barber in Nature(June, 1895), that in Antiguaticks leave infested cattlewhen they are changed to abelter pasture. On theother hand, I am unable togather that the poorer sheepon the hills are more suscept-ible than those in better condi^tion; but have been in-formed that the contraryis to some extent the is, however, among sheepfreshly imported on tofoul ground that thegreatest mortality takesplace. A satisfactory ex-planation of an immunity,which does not seem todepend altogether on the condition of the animal,might go far towards suggesting the direction thatexperiments should take with a view of minimisingthe evil. [Mr. Wheler would be much obliged if corre-spondents would favour him with specimens, livingpreferred, of any other British species of the genusIxodes, with particulars of the circumstances underwhich thev were found. His address is SwansfieldHouse, Alnwick.]—Ed. .S. G. (To IC continued). SCIENCE-GOSSIP. COLLECTION AND PREJARATIOX OF FORAMIMFERA. llv AkiHUK Earlami. Collecting. T-HE three chief sources from which forami-nifera may be obtaine<i are :— :. Dredgings from the sea bottom. With thesemay be incUided muds from ships anchors, or cablegrapnels, and the debris from fishermens trawls. 2. Shore gatherings made between tide marks. 3- Foraminiferous sands, clays and limestones ofvarious geological ages, especially Cretaceous andTertiary. The method of preparation is essentially thesame for materials of the first and second dredged material, however, the foraminifera asa rule constitute but a small percentage of the totalbulk of the material, globigerina ooze being thechief , whilst in shore gatherings theamount of foreign material present, is largely de-pendent upon the care with which the gatheringhas been made, and the skill of the collector. Indealing with the fossil materials of the third classconsiderable deviations fr
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