642 



SCIENCE 



[N. S. Vol. XXXVI. No. 932 



not pregnant during the first 31 days, when 

 these records were kept. The certainty of this 

 condition is Ivnown, for the animals had not 

 brought forth young at the end of 68 days of 

 observation. 



RESULTS IN THE NON-PBEGNANT KABBITS 



Owing to the scarcity of guinea-pigs at the 

 time we attempted to secure them, work was 

 carried on with but five females. The same 

 apparent stimulating effect of suprarenalin 

 on the growth and well-being of the adults 

 and young was noted in two of these females. 

 The data of this group are not complete. 



The fowls exhibited no symptoms of dis- 

 comfort or illness during treatment. 



Eggs were secured from the fowls treated, 

 but their paucity and the infertility of a 

 large proportion of both the eggs of drugged 

 hens and the control fowl render the data 

 scarcely worth considering. 



We may conclude from this study that 



1. Thyroid fed in considerable quantities to 

 pregnant female rabbits produces weakness in 

 the offspring. 



2. Thymus is similar in its effect on the off- 

 spring. 



3. Suprarenalin does not hinder develop- 

 ment in the rabbit, but appears to slightly 

 accelerate growth. 



4. Thyroid and thymus are most injurious 

 to the suckling rabbit. 



5. The fowl is not materially affected by 

 doses of thyroid and thymus which produce 

 diarrhea, tachycardia and alopecia in the 

 rabbit. F. E. Chidester 



Cold Spring Harbor, 

 Long Island, N. Y., 

 September 10, 1912 



NOTICE OF NEWLY DISCOVERED EURYPTERIDS IN 

 NEBRASKA 



A BED of Eursfpterids has just been discov- 

 ered by the Nebraska Geological Survey in the 

 Carboniferous shales of southeastern Ne- 

 braska, and thus a new locality is added to the 

 list for the United States. Such localities are 

 somewhat rare, and notice of any and every 

 new one must be acceptable. 



The Carboniferous outcrops are confined to 

 some eight or ten counties in the extreme 

 southeastern corner of the state, and though 

 covered heavily by glacial clays, bold ex- 

 posures occur in proximity to the bolder 

 streams, especially the Missouri River. About 

 a mile south of Peru, on the Missouri Eiver 

 front, the bluffs are limestones interbedded 

 with thin layers of shale. But within a few 

 hundred feet the shale thickens until the 

 limestone pinches out altogether, and within 

 as many feet the shale becomes increasingly 

 arenaceous until it merges into a bed of mas- 

 sive cross-bedded sandstone. Within a mile 

 this order is symmetrically reversed. 



About one and a half miles south of Peru 

 and immediately at the side of the Burling- 

 ton track, and some thirty feet above the 

 river, there occurs in this massive sandrock 

 an irregular bed about a foot thick compris- 

 ing alternating bands of sand and thin layers 

 of compact slate-colored shale. These shale 

 seams are seldom thicker than a quarter of an 

 inch. They cleave readily and expose sur- 

 faces covered by innumerable leaves, stems, 

 and their fragments. Neuropteris pinnules, 

 and stems of Calamites are abundant. 



Associated with these are the newly dis- 

 covered Eurypterids. From observation in 

 the field they seem to be adults, and yet they 

 are diminutive, measuring but IJ inches 

 (38 mm.) in length. They appear to be fairly 



