25 
33 Bay ley (W. S.). Spherulitic volcauics at North Haven, Maine. 
Geol. Soc. Am., Bull., vol. vi, pp. 474-476. 
Describes the occurrence and characters of volcanic rocks, basalts, and 
rhyolites associated with Niagara limestones and sandstones in this 
vicinity. 
34 Van Hise (C. R.) and. Preliminary report on the Marquette 
iron-bearing district of Michigan. 
U. S. Geol. Surv., 15th Ann. Rept., pp. 477-650, pis. xiii-xxvi. 
See Van Hise (C. R) and Bayley ( W. 8.), No. 503. 
35 Beadle (H.M.). The Iron Mountain mine [Montana]. 
Eng. and Mg. Jour., vol. lx, p. 562. 
Brief description of the silver-lead ore bodies of this district in Mis- 
soula County, Mont. 
36 Becker (George F.). Gold fields of the southern Appalachians. 
U. S. Geol. Surv., 16th Ann. Rept., Part III, pp. 251-331, pis. xvi-xviii. 
Describes the geography of the region and gives a history of mining 
operations and statistics. Describes the characters of the rocks of the 
gold fields, their geologic structure, the gangue minerals, veins, impreg- 
nations, and placers. Includes descriptive notes of the Georgian belt, 
South Mountain mining district, North Carolina, and the Carolinian belt, 
and a review of the history of the gold iields of the British maritime 
provinces and of the Green Mountains. A bibliography of the subject 
is also given. 
37 The torsional theory of joints. 
Am. Inst. Mg. Engrs., Trans., vol. xxiv, pp. 130-138 and 865-867. 
Describes the phenomena of joints, reviews some of the explanatory 
hypotheses and the results of the author's experiments, and discusses the 
torsional theory and the character of torsional rupture. 
38 Distribution of gold deposits in Alaska. 
Jour, of Geol., vol. iii, pp. 960-962. 
Gives a brief description of the gold deposits of Alaska. 
39 Beecher (Charles E.). Further observations on the ventral struc- 
ture of Triarthrus. 
Am. Geol., vol. xv, pp. 91-100. 
Describes the ventral structure of Triarthrus as shown by additional 
characters observed since the publication of the last paper on this trilo- 
bite. 
40 The larval stages of trilobites. 
Am. Geol., vol. xvi, pp. 166-197, pis. viii-x. 
Describes the characters of the protaspis and gives a review of the 
larval stages of trilobites and an analysis of the variations of trilobite 
larva?. Describes the antiquity of trilobites, the restoration of the pro- 
tapsis, and the development and characters of the crustacean Nauplius. 
Gives a summary, list of bibliographic references, and explanation of 
plates. 
41 Structure and appendages of Trinucleus. 
Am. Jour. Sci., 3d ser., vol. xlix, pp. 307-311, pi. iii. 
Mentions the genera allied to Trinucleus and the homologous features 
in other trilobites. Describes and figures the appendages of Trinucleus 
concentricus, found associated with Triarthrus becki in the Utica slate 
near Rome, N. Y. 
