(5

Ehrenberg remarks, that as many forms as 37 species are common to the several of the packets, the dust collected by myself, & the four packets given Lieut James four packets & my one, that they the dust on four successive all days by Lieut. James, must certainly have come from the same quarter; I may remark that yet mine was brought by a ENE wind wind, & Lieut. James's by an a SE and ESE wind. The infusoria are all old known species, excepting one allied to a Hungarian fossil & they are of freshwater species origin with the exception of two (Grammatophora oceanica and Textilaria globulosa), which are certainly marine. Prof. Ehrenberg could not detect any of the the dryed up soft parts, so that it would appear, that as if the infusoria had been quickly dryed up, & hence it would appear that they must have been caught up by the wind sometimes after having been being dead. The greater number of the species are of wide or mundane distribution; but two four species are common to Lugano & Senegambia and S. America, & two are peculiar to the latter country: but moreover it is a very singular fact, that out of the many ass forms known to Professor Ehrenberg as characteristic of Africa generally & of Sahara & Senegambian regions, none were found in the dust. Hence Professor Ehrenberg doubts does not know whether the dust comes from Africa. Nevertheless, that From these facts one might at first doubt whether the dust came from Africa; but considering that the dust it has invariably fallen with the wind between NE and SE, that is from the coast of Africa; that the first commencement of the haze has been observed with seen to come on with the these winds; that coarser particles have first fallen; that the dust & hazy atmosphere is more abundant & constant common near the African coast than further in the Atlantic; & lastly, that the months during which it falls, coincides with those when the harmattan is known to blow from the continent, & when