REPORT ON NATIONAL MUSEUM. 161 



On zonocLlorite aud chlorastrolite. 



(Am. Jonr. of Science, 1875, X, pp. 24-26.) 



Concludes from chemical and microscopic examination that these are not 

 true mineral species, hut rather impure varieties of phrenite. Reviewed by 

 Rosenbusch in the Neues Jahrbuch for 1875, p. 750. 



[Analysis of durangite.] In Prof. G. J. Brusli's article on "The cLemical 

 composition of dnrangite." 



(Am. Jour, of Science, 187G, xi, p. 464.) 



The rocks of the "Chloritic formation" on the western border of the 

 Kew Haven region. 



(Am. Jour, of Science, 1876, xi, pp. 122-126.) 



Gives the results of microscopic and chemical examinations of certain met- 

 amorphic rocks in the vicinity of New Haven, Conn. Concludes that they are 

 true dolerites, diabases, and metaphyres, and distinguishes them from similar 

 eruptive rocks by the prefix meta. 



On a lithia-bearing variety of biotite. 



(Am. Jour, of Science, 1876, xi, pp. 431-432.) 



Finds that the black biotite from the feldspar quarries of Portland, Conn., 

 contains some 0.95 per cent, of lithia, which replaces a part of the potash. 



On the greenstones of New Hampshire and their organic remains. 



(Am. Jour, of Science, 1876, xii, pp. 129-137, 1 plate.) 



Gives the result of numerous chemical and microscopic examinations of the 

 so-called greenstones of New Hampshire, and also describes and figures cer- 

 tain forms contained in them, which appear to be of organic origin. These 

 forms, which excited considerable interest at the time, proved, on further 

 examination, to be but the peculiar skeleton- like forms left by decomposing 

 titanic iron. 



On grains of metallic iron in dolerites from New Hampshire. 



(Am. Jour, of Science, 1877, xiii, pp. 33-35.) 



Mineralogy and lithology of New Hampshire, by George W. Hawes, in- 

 structor in mineralogy in the Sheffield Scientific School of Yale Col- 

 lege. Part IV, of the third volume of the Geology of New Hamp- 

 shire, 262 pp., royal 8vo, with 12 plates. Concord, N. H., 1878. 



This, the most important work of the author's life, gives the results oi 

 extensive research upon the chemical and microscopic properties of what may 

 be regarded as tjrpical rocks and minerals of New Hampshire. It also con- 

 tains extensive notes upon the external characters, economic value, and gen- 

 eral distribution of the rocks over the State, together with a short treatise 

 upon the method of study with the microscope. 



The rocks of the "Chloritic formation" on the western border of the 

 New Haven region. 



(Am. Jour, of Science, 1878, xv, p. 219.) 



A note on the previous paper published in this journal, XI, 1876, p. 122. 

 The author finds on further examination that a certain mineral, supposed at 

 first to be a pyroxene, is hornblende, and that the rock belongs therefore to 

 the diorite group. 



H. Mis. 26 11 



