half. The stamen are in series that is to say inserted one group at the bottom of the tubule 

 and the other on the neck. For about 30 years, I have known from an article published in 

 1853 in the Horticultural Revue, of the large red flowers of the Mammillaria senilis. 

 Unfortunately that was a very incomplete description. The sketch that accompanied it 

 always seemed to represent something other than a Mammillaria. Nothing resembled it 

 with exactitud. 



However today I have a large photograph (natural size) with a very detailed 

 description made by Mr. Schlumberger in Rouen in 1853, 1873 and 1876 and in Paris in 

 1873. Unfortunately I have not been able to observe the open flower. Thanks to Mr. 

 Schlumberger I was able to study the dried flower and phorograph it. These documents 

 were sent by him in 1873 to Mr. Morren editor in chief of the "Belgique Horticale". He 

 wrote the article and it was published with colored drawings. He created a subgender of 

 this plant and named it Mammillopsis. 



The more we study the Cacti the more we appreciate that many species do not have 

 a place in our System. We will talk about this when I have the honor of seeing you. 



In the meantime please be reassured of my friendship and admiration. 



F. Weber 



Translation. M. Thurmann 



