Two engravings of the 18th century

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Please help evaluate the two engravings of the 18th century :

The first one : St. Ambrose stops Theodosius , with a dedication to gr. Stroganov , engraving sheet, 1799
Engraving 59h42 , 5 ( the sheet 63h50 )

At the bottom on either side of the emblem : "His excellency the Count Alexander Sergeyevich Stroganov Imperial Academy of Arts president
Ardent students of the Academy of offering E.Chuksina . "

Chuksina EVSTAFIEV ILYICH (Tchouksine)
1780 - 1817
Education received in St. Petersburg Imperial Academy of Arts , a course which he graduated in 1800 with a certificate of the first degree , and was a student Klaubera . During his stay at the Academy in 1799 Chuksin received a silver medal engraving . This marked a medal , engraving , is represented here .

 And next year - a small gold medal " of the problem , representing St. Ambrose , who rejects the gifts brought to the altar of the Emperor Theodosius, for the murder of 40,000 innocent ." After leaving the Academy of Fine Arts , Chuksin served briefly in the Map Depot , and later - when chief superintendent Georgia.

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" Kind of rock , called the Thunder , length 44, width 22, height was 27 feet , found in Lahti in 1768 , the year " 48h73

The stone for the monument , Petru1 ( "The Bronze Horseman ")
Engraver Schlei -

 (JV Schley) - Berlin cutter engraver , who was in St. Petersburg in 1768-1775 years. nagravirovavshy and there are three boards with a view of the thunder - stone ; a follows: 1. " Kind of rock , called the Thunder , length 44, width 22, height was 27 feet , found in Lahti in 1768 , the year 2." Type opening of stone , called the Thunder, appointed to the foot of the Monument to Peter the first . " - 3. " View thunder stone during the transportation of it in the presence of Catherine vtoryya January 20 th 1770 the first year . " under each signature :" G. Velten, del. -J.V. Schley, sculpsit