Read online at https://bahai-library.com/abdul-baha_tablet_auguste_forel
Mentioned in Light of Divine Guidance (vol2), pp. 5 and 18-19.
(August Forel himself is also mentioned in God Passes By, pgs. 316, 375 and a very brief mention of his daughter is made on p. 68 of Light of Divine Guidance (vol2).)
One of the most weighty Tablets the Master ever wrote--a Tablet of far-reaching importance[edit]
"The famous scientist and entomologist, Dr. Auguste Forel, was converted to the Faith through the influence of a Tablet sent him by `Abdu'l-Bahá--one of the most weighty the Master ever wrote. Another Tablet of far-reaching importance..."
- (Shoghi Effendi, God Passes By, pp. 307-308)