568 



SCIENCE. 



[N. S. Vol. III. No. 67. 



recommends the use of the ' Normal Pyrometric 

 Cones,' invented by Dr. Seger, as affording a 

 safe and simple method of controlling the tem- 

 perature of the kiln. He considers it quite 

 possible to prepare cones from our domestic 

 materials, fully as reliable as those now made 

 in Germany. 



In Chapter V. that subject often so troublesome 

 to pottery makers — Glazes, their requirements 

 and composition — is presented. The various 

 kinds of AVare, Bricks and Terra Cotta comprise 

 the succeeding chapters up to the fourteenth, on 

 Refractory Materials, in which the preparation 

 of fire clays for use in kiln building and for 

 "saggars," is fully explained. Sixteen pages 

 on Burning the Ware, in which the requisites 

 of this important part of pottery making are in- 

 terestingly detailed, form the final chapter. A 

 convenient index follows. 



A few more illustrations or diagrams in the 

 body of the work would have given it added 

 interest for the majority of chemists who have 

 only a superficial knowledge of the processes of 

 pottery making. Fn.iNK H. Thoep. 



SCIENTIFIC JOUBNALS. 

 JOURNAL OF GEOLOGY, FEBEUAKY-MAECH. 



Kame Ai-eas in Western New York South of Ir- 

 ondequoit and Sodus Bays : By H. L. Faiechild. 

 The purpose of the paper is to describe certain 

 massive deposits of sand and gravel apparently 

 formed by the glacial drainage. These bays 

 are the extreme points in the great landward 

 curve in the south shore of Lake Ontario, and 

 are thought to have greatly influenced the drain- 

 age of the region during the recession of the ice. 

 Four Kame areas are described — Irondequoit, 

 Victor, Mendon and Junius. The author finds 

 these areas alike in the following particulars: 

 (a) they are located in the basin of Lake War- 

 ren ; (b) they have an overwash or silt plain to 

 the southward ; (c) they lie in the midst of 

 drumloid ridges which antedate the kame de- 

 posits ; (d) only one has any clear connection 

 with an extended frontal moraine. He thinks 

 the causation is complex, including rapid ice 

 retreat, action of lake waters to prevent great 

 local accumulations of moraiuic till and heavy 

 glacial drainage. 



A Pre- Tertiary Nepheline-Bearing Bock : By F. 

 Bascom. The rock in question is a glacial boul- 

 der found in the vicinity of Columbus, Ohio. 

 There was a single specimen about a foot and 

 one-half in diameter, but it is of a type so rare 

 as to justifyr in the mind of the author a particular 

 mention. She inclines to the opinion that it be- 

 longs to the nepheline syenite porphyry group. 

 The source is not known, but is presumed to be 

 the area north of Lake Huron, and if so the 

 boulder is from a Cambrian horizon or lower. 

 In any case it is a pre-Tertiary dike or surface 

 volcanic resembling the modern type. 



Bemarks on Petalodus Alleghaniensis (Leidy): 

 By Chas. R. Eastman. In a previous issue of 

 the journal Dr. Hay described a specimen of 

 Selachian tooth from the Carboniferous of Illi- 

 nois. For the form he proposed the name Peta- 

 lodus Securiger. In the present paper the 

 author dissents from this view and gives reasons, 

 why the new name should not be accepted. 

 His opinion is that the form belongs to P. Alle- 

 ghaniensis. 



Patalocrinus Mirabilis (N. sp.) and a New 

 American Fauna : By S. Wellee and Mes. A. 

 D. Davidson. The fossils here described were 

 collected by the junior author in Jones county, 

 Iowa. Goniophyllum pyramidale and the species 

 of Crotalocrinus have long been known in the 

 Gothland limestone of Sweden. In this Iowa 

 Silurian fauna, species of Goniophyllum are 

 found indistinguishable from those of Gothland, 

 with a crinoid whose nearest ally is Crotalo- 

 crinus. The crinoid, which is a new one, is 

 carefully described and figured by the senior 

 author, who finds an explanation of the simi- 

 larity between the Gothland and Iowa faunas 

 in a migration along a supposed shore line, join- 

 ing the east American and British regions during 

 Niagara time. 



On the Nature of Igneous Intrusions : By Is- 

 EAEL C. Russell. In a previous paper the au- 

 thor described some hills in the Black Hills re- 

 gion, which illustrated a little known phase of 

 igneous intrusion. He now discusses igneous 

 intrusion in the light of his large experience in 

 many localities. Of these he finds several 

 classes — intruded sheets like those of the New- 

 ark which, when widely extended are of easily 

 fusible rock and relatively surperflcial, lacco- 



