spondents. We have on hand a mass of interesting and valuable cor-respondence, and there must necessarily be some delay in itsappearance; but it shall be attended to as fast as space willpermit, and we shall be glad to get more of the same sort.If you have got anything practical you wish to bring… … We invite the attention of our readers to the announce-ment for the forthcoming Volume, 1870, on another pageIt will be seen that premiums are to be given to all whosend lists of subscribers ef twenty names and upwari. Fig. 2 is a blowpipe for light work which a contributor tothe paper alluded to…
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