496 KANSAS CITY REVIEW OF SCIENCE. 



ly into the sand and left a record to prove that his age of Hfe was not Triassic, 

 Taut was long after the close of the Cretaceous age. For those are not the tracks 

 of cold, but of warm-blooded animals ; and my friend was evidently an active 

 member of the great family called Cants. 



I desire to put this discovery, crude as it is, on record) that the attention of 

 men of more time and means than myself and be directed to it, and so help settle 

 a long-standing doubt, which appears to exist, even in the minds of those who 

 found the Triassic formation so constant here in these typical sections "that it is 

 no exaggeration to say it can readily be recognized at a glance." 



From the extracts given, and the facts herein noted by myself, I feel that all 

 of my readers will recognize the difficulty I had in finding the Jura-Trias when I 

 examined the very sections pointed out in the U. S. Reports, and why I had to 

 come to the conclusion that they do not exist at all. 



GEOGRAPHY. 



BOLIVIA A NEW SOURCE FOR RUBBER. 



The principal facts given below were first published in the Review with a 

 "map of the Beni River region explored by Dr. Heath, in the September Number 

 -of 1 88 1, in an article entitled "Explorations in South America." Both Dr. E. 

 R. Heath and his brother Dr. I von D. Heath have contributed to the Review arti- 

 cles of great value, during the past three years, upon the geography, climate and 

 archaeology of South America, and we are glad to see that their work is beginning 

 to be equally appreciated elsewhere. — Ed. Review. 



Dr. Edwin R. Heath has given a reporter of The World an account of his 

 recent explorations of the Beni River, in Bolivia and the adjacent country. 

 To Dr. Heath belongs the credit of being the first to make a complete explora- 

 tion of the River from its source at La Paz to its junction with the River Mamore. 

 He has made many discoveries of geographical interest, such as locating the 

 mouths of the Madre de Dios and the Or ton Rivers. He has collected also much 

 material of value to the zoologist, botanist, and geologist, and a full account of 

 his researches will shortly be published by the American Geographical Society 

 and the Royal Geographical Society of England. The commercial value of his 

 discoveries is that he has established the fact that the Beni River is navigable by 

 large steamers from its mouth to near Reyes, a distance of 525 miles, and for 300 

 milf s further by craft of less than three feet draft. At its mouth the Beni River 

 is a little over half a mile wide and 50 feet deep at lowest water. At Reyes it is 

 800 feet wide and 30 feet deep. 



