Autograph letter signed : Prague, to Erwin Finlay Freundlich, 1912 Jan. 8.

Discussing light deflection at length. Stating that Einstein is very glad that Freundlich embraces the matter with such enthusiasm, and expressing curiosity to learn the results of Freundlich's related research (which he will obtain from examining photographic plates), emphasizing that this is a matter of fundamental importance. Noting that theoretically it is probable that the effect exists, stating that they could soon know more if Freundlich were able to conduct daylight observations on fixed stars close to the sun. Inquiring as to whether Freundlich has calculated how low the density of the Sun's atmosphere needs to be in order to see the fixed stars through it. Mentioning that a very light density causes a deflection of light, and further discussing the topic, referring to his own work. Asking Freundlich to keep Einstein up to date on his research.