384 !'■ I). IIAII X. 



never a^ain to treat witli anxthins^^ hut the utmost re.s])ect one 

 who had g^one through so many critical experiences. 



Hahn was for years known as the " Father " of the South 

 African Colletie. for the simple reason that he had served longest 

 on the professional staff, l)ut the title also rested on a sounder 

 foundation : apart from his relation to his classes collectively, 

 he made a s])ecial point of getting to know all he cimld alx)Ut 

 each student as an individual. This characteristic went far to 

 account for the personal attacliment of his jKist students: when 

 any student, past or present, was in difficulty of any kind, 

 either by reason of some misdeed, trifling or serious, or through 

 no fault of his own. Hahn would take him into his sanctum 

 and deal ver\- frankly and ])aternally with him, and there are 

 men to-da\' who have admitted that they owe their old Professor 

 more than they could ever rejiay, and that not so much for the 

 chemistrv as the moral lessons which he had imprinted on them 

 during times of crisis. 



Prof. Hahn was twice ('resident of the Cape Chemical 

 Society: in 1903 he was President of Section A c-i the South 

 African Association for the Advancement of Science, and in 

 191 1, at its Bulawayo meeting. President of the whole .Vssocia- 

 tioii. He was also a member of the British Association for the 

 Advancement of Science, an honorary member of the Chemical. 

 Metallurgical and Mining .Society of South Africa, aaid a mem- 

 1>er of the South African .Association of Analytical Chemists. 

 He likewise held the position of an extra-Academical lecturer of 

 the Universities (^f Kdinburgh, Aberdeen, (xla-sgow, and St. An- 

 drew's. Several of his former pupils have filled jniblic posi- 

 tions requiring a knowledge of chemistry, and all of these without 

 exception have realised to the full their deep indebtedness t<» 

 Hahn for the very careful instruction which laid the foundation 

 of many a career of usefulness and of value to South Africa. 



C. F. I. 



Utilisation of Tomato Waste.— T he Unit e d 



States Department of Agriculture has published a Bulletin 

 (No. 632) on the utilization of waste tomato seeds and skins, by 

 F. Rabak, chemical biologist for drug-plant and poisonous-ijlant 

 investigations. The oil from the seeds should find ready disposal 

 as an edible or soap oil. or, after proper treatment, as a drying 

 oil for paint and varnish pur}X)ses. The meal possesses valuable 

 qualities as a stock food, and in view of the shortage of fatty oils, 

 as well as in the interests of iood con.servation, tomato refuse ma\ 

 be considered as an available source for the manufacture of oil 

 and cake. It was suggested that the utilization of this material 

 should be considered as an econonn'o uu-aNure of both agricultural 

 and industrial importance. 



